A guide rail assembly for use on each of opposite sides of a drawer to guide movement of the drawer into and out of an article of furniture includes a supporting rail to be attached to a furniture side wall, a pull out rail to be attached to the drawer, and at least one carriage for load transmitting rollers situated between the supporting rail and the pull out rail. The pull out rail and the supporting rail are provided with stops for limiting movement of the pull out rail and the carriage with respect to the supporting rail. The carriage is provided with buffers, whereby the carriage and the buffers are made in one piece of plastic material. The buffers each have the form of a meander or serpentine shaped protrusion.